US PATENT SUBCLASS 411 / 238
.~.~.~.~.~ At least one of the formations comprises a surface eccentric to the longitudinal axis of the nuts


Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

190  DF  HAVING STRUCTURE TO RESTRICT ROTATION OF THREADED, MATING PIECES (E.G., NUT LOCK) {13}
204  DF  .~ Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece {7}
222  DF  .~.~ Internally threaded locking member (e.g., jam nut) {1}
223  DF  .~.~.~ Including means associated with at least one of the nuts for restricting rotation therebetween {11}
237  DF  .~.~.~.~ Having a part of one of the nuts extending into a circular, axially directed recess of the other, and further including, in the region of the recess, formations cooperating to restrict relative rotation {1}
238.~.~.~.~.~ At least one of the formations comprises a surface eccentric to the longitudinal axis of the nuts


DEFINITION

Classification: 411/238

At least one of the formations comprises a surface eccentric to the longitudinal axis of the nuts:

(under subclass 237) Device wherein one of the structural features is a surface generated about an axis (or axes, if of varying curvature) which is offset from the longitudinal axis of the elements, and further wherein a slight rotation of one of the elements relative to the other brings that surface into binding engagement with a surface on the other element, which latter surface either is not eccentric or, if eccentric, is of a different eccentricity.

(1) Note. The engagement of the member (here, the secondary internally threaded element) with the axially outwardly facing portion of the internally threaded element (here, the primary such element) required by subclass 204 may be somewhat remote in the art of this subclass (238); however, the eccentricity proposition involved appears sufficiently peculiar to the jam nut concept to warrant its inclusion with that art.